65815061 has 4 divisors (see below), whose sum is σ = 70877772. Its totient is φ = 60752352.

The previous prime is 65815049. The next prime is 65815063. The reversal of 65815061 is 16051856.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38514436 + 27300625 = 6206^2 + 5225^2 .

It is a cyclic number.

It is not a de Polignac number, because 65815061 - 2⁶ = 65814997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65815063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531336 + ... + 2531361.

It is an arithmetic number, because the mean of its divisors is an integer number (17719443).

Almost surely, 2^65815061 is an apocalyptic number.

It is an amenable number.

65815061 is a deficient number, since it is larger than the sum of its proper divisors (5062711).

65815061 is a wasteful number, since it uses less digits than its factorization.

65815061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062710.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 65815061 is about 8112.6482112810. The cubic root of 65815061 is about 403.7461828405.

The spelling of 65815061 in words is "sixty-five million, eight hundred fifteen thousand, sixty-one".